IMAGE SENSOR UNIT AND IMAGE READING DEVICE

摘要

A contact-type image sensor is designed to prevent, in an effective manner, dust from entering into a space between a rod lens array and a light receiving sensor. A rod lens array includes a large number of rod lenses between two flat substrates and between spacers located at left and right ends; one row of the rod lenses is arranged in such a way that central axes of the rod lenses become parallel to each other. At an emission side of a rod lens in an axis line direction, each substrate includes an extension portion, whose length is determined based on an operating distance of the rod lens. A lower end of the extension portion of each substrate is in contact with an upper surface of a sensor substrate. In this manner, the rod lens array is positioned with high accuracy with respect to the light receiving sensor.

主权项

1. An image sensor unit comprising:
a rod lens array in which a plurality of columnar rod lenses are arranged between two flat substrates; and a light receiving sensor in which a plurality of photoelectric conversion elements are mounted on a sensor substrate to receive light of an image that is formed through each of the rod lenses of the rod lens array, wherein each of the substrates of the rod lens array includes an extension portion that extends a predetermined distance toward an emission side of the rod lens array, and the extension portion of each of the substrates of the rod lens array is engaged with the sensor substrate, and is disposed in such a way that optical axes of the rod lenses are aligned with the photoelectric conversion elements.